Shot noise of coupled semiconductor quantum dots

TL;DR

This paper investigates the low-frequency shot noise in coupled semiconductor quantum dots, analyzing how Coulomb interactions and Pauli exclusion influence current fluctuations and predicting experimental outcomes.

Contribution

It provides a detailed theoretical analysis of Coulomb interaction effects on shot noise in coupled quantum dots using a master equation approach.

Findings

Coulomb interaction significantly affects shot noise behavior.

Negative differential conductance can lead to super-Poissonian shot noise.

Predictions for future experimental verification are presented.

Abstract

The low-frequency shot noise properties of two electrostatically coupled semiconductor quantum dot states which are connected to emitter/collector contacts are studied. A master equation approach is used to analyze the bias voltage dependence of the Fano factor as a measure of temporal correlations in tunneling current caused by Pauli's exclusion principle and the Coulomb interaction. In particular, the influence of the Coulomb interaction on the shot noise behavior is discussed in detail and predictions for future experiments will be given. Furthermore, we propose a mechanism for negative differential conductance and investigate the related super-Poissonian shot noise.